Coral




 * Brain corals extend their tentacles to catch food at night,
 * During the day, the brain corals use their tentacles for protection by wrapping them over the grooves on their surface,
 * The surface is hard and offers good protection against fish or hurricanes,

Sources: http://upload.wikimedia.org/wikipedia/commons/5/56/Brain_coral.jpg http://en.wikipedia.org/wiki/Brain_coral

By: Lindsey